I think "task-specific" here refers to just two characteristics:
• Not general purpose. (Hence the "specific".)
• Close to the tasks someone wants to do. You don't have to combine too many primitives to get to something useful.
Though the line of "too many" is fuzzy and subjective, of course. In general, I think "easy" really just means "no high energy barriers". Not everything is nearby, but some things are nearby, and the rest can be reached by gradual climbing without hitting any insurmountable obstacles.